Need nuts that won't shake loose? This 100-pack of 1/4-28 Nylon Insert Lock Nuts from Fastenere has got you covered. They're the go-to for stopping bolts from backing out due to vibration – think lawnmowers, go-karts, furniture, automotive stuff, or any project that moves or rattles. Here's how they work: there's a nylon ring (the 'insert') inside the nut. When you screw it onto a bolt, the nylon grips the threads, creating friction that keeps it locked in place. They're made from Grade 2 steel with a zinc plating and a clear finish, which helps fight off rust for indoor or occasional outdoor use. The size is 1/4-inch with 28 threads per inch, and they have a standard 7/16-inch hex head so you can use a regular wrench or socket. They're about 0.328 inches tall. Are they reusable? You can usually get a few uses out of them, but for critical safety stuff (like brakes), it's always best to use new ones. For most DIY and repair jobs, though, they're perfect. This big pack means you'll have plenty on hand for current and future projects, saving you multiple trips to the hardware store. Solid, reliable fasteners at a great bulk price.